namespace Galaeth.Core.Extensions;

/// <summary>
/// Extension methods for strings.
/// </summary>
public static class StringExtensions
{
    /// <summary>
    /// Mask an email address for logging purposes.
    /// </summary>
    /// <param name="emailAddress">The email address to obfuscate.</param>
    /// <returns>The obfuscated email address, or the original if there's an issue with the email address.</returns>
    public static string MaskEmailAddress(this string emailAddress)
    {
        if (string.IsNullOrWhiteSpace(emailAddress))
        {
            return string.Empty;
        }

        if (!emailAddress.Contains('@'))
        {
            return emailAddress;
        }

        if (emailAddress.StartsWith('@'))
        {
            return emailAddress;
        }

        return $"{emailAddress[0]}****{emailAddress[(emailAddress.IndexOf('@') - 1) ..]}";
    }
}